Bugatti has finally hit the ceiling for power, but hasn't stopped making its Chiron hypercar even faster.

The French hypercar brand revealed a lighter, more focused version of the world's fastest production car, the Chiron Sport, at the Geneva motor show.

Unlike the previous Veyron, in which Bugatti extracted more power from its 8.0-litre quad turbo W16-cylinder engine for faster variants such as the Supersports, the Sport retains the Chiron's already ludicrous outputs of 1100kW and 1600Nm.

But a host of weight saving measures have shaved 18kg from its mass, and stiffer suspension settings, revised steering and the adoption of torque vectoring within the all-wheel drive system has resulted in the car being five seconds quicker around Volkswagen's Nardo handling circuit in Southern Italy.

While faster through the bends, the Chiron Sport is no quicker in a straight line than the standard car. Even still, with a claimed ability to hit 100km/h in under 2.5 seconds and maxes out with an electronically-limited top speed of 420km/h.

“We have developed the Chiron Sport for customers wanting an even sportier driving experience with their Chiron, with improved lateral dynamics on winding roads,” Bugatti president Stephan Winkelmann said.

“What was important for us was to leave unchanged the unique character of the Chiron; its combination of ultimate performance, longitudinal acceleration and maximum speed with luxury, comfort and everyday usability."

Among the lightweight parts, the Chiron features a world-first carbon fibre windscreen wiper as well as thinner rear-window glass, and carbon fibre anti-roll bars and intercooler covers.

Along with its eye-watering performance, the Chiron Sport comes with a huge price tag, costing US$3.2 million.

Looking further ahead, Winkelmann confirmed to Britain's Autocar that Bugatti is continuing development work on a hybrid-powered replacement for the Chiron and investigating a second model line that could see a hugely-powereful four-door sedan join the brand. Bugatti has experimented with the idea since falling under the umbrella of the Volkswagen Group, revealing the Galibier concept almost a decade ago.